Re: [ISOFS] Troubles with multi session DVDs.
Il Sat, Jun 26, 2004 at 08:52:27PM +0200, Andy Polyakov ha scritto:
> *This message was transferred with a trial version of CommuniGate(tm) Pro*
> >I'm having a strange (at least for me) problem burning multisession
> >DVD+R media: the dvd becomes unreadable after the 3rd session is burned.
>
> I have all reasons to believe that it rather has everything to do with
> position of last session, than with the exact number of sessions. I also
> have all reasons to believe that it's rather ide-cd.c bug than isofs. In
> other words this problem was already reported to me, but I didn't have
> time to bring it up with linux-kernel people yet.
>
> >mount refuses to do its work, and kernel says:
> >
> >Unable to identify CD-ROM format.
> >
> >Note that there isn't any read error, so the kernel is simply unable to
> >locate the primary volume descriptor.
>
> The keywords for this problem are:
>
> >growisofs -M /dev/hdc -J -r <files> (-Z for the first session)
> ^^^ ide-cd.c is involved [it's no problem with sr.c
> if unit is routed through ide-scsi.c]...
>
> >This is the output of dvd+rw-mediainfo:
> >...
> > Multi-session Info: #3@1339392
> ^^^^^^^ ... and last recorded session
> starts beyond LBA #1152000, which corresponds ~2.2GB.
>
> What's so special about 1152000 (besides that it reminds highest posible
> bitrate for serial port:-) It's 256 times 60 times 75. What's so special
> about these numbers? 256 is amount of interger values which can be
> represented with 8-bit number, 60 is amount of seconds in minute and 75
> is amount of frames in one second of CD-DA. Yes, it's about conversion
> from MSF to LBA suffering from overflow around 2.2GB. In the nutshell
> the problem is that drivers/ide/ide-cd.c always pull TOC in MSF format
> and then attempts to convert it to LBA. If last session is recorded
> beyond 1152000, isofs driver will be led by ide-cd driver to belief that
> volume descriptor resides at 1152000, which in turn results in "unable
> to identify CD-ROM format" message logged upon mount attempt.
>
> As fast-acting remedy I can suggest to route your unit through ide-scsi.
> The way it was under 2.4. Even though it's declared unsupported it
> actually still works in 2.6 (I for one still use it). And once ide-cd.c
> is fixed you'll be able to revert back to officially recommended path.
Yes, I can confirm that with ide-scsi I can read the dvd without
problems.
Jens are you aware of this bug in ide-cd?
Luca
--
Home: http://kronoz.cjb.net
"Su cio` di cui non si puo` parlare e` bene tacere".
Ludwig Wittgenstein
Reply to: